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Giller, K E and Wani, S P and Day, J M and Dart, P J (1988) Short-term measurements of uptake of nitrogen fixed in the rhizospheres of sorghum (Sorghum bicolor) and millet (Pennisetum americanum). Biology and Fertility of Soils, 7 (1). pp. 11-15. ISSN 0178-2762